Year	Percent
1990	0.00101
1991	0.02007
1992	0.10004
1993	0.19945
1994	0.69599
1995	0.99166
1996	2.96841
1997	4.93808
1998	7.88662
1999	13.77221
2000	29.43169
2001	31.2884
2002	46.33
2003	49.97
2004	53.86
2005	55.82
2006	59.72
2007	64.44
2008	66
2009	70
2010	75
2011	81.61
2012	80.71999
2013	82.1702
2014	85
2015	85.0529
2016	86.5165
2017	87.67968